期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 42, 期 9, 页码 3802-3811出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2022.03.050
关键词
Multilayer structure; Ablation resistance; Finite element analysis; Sublayer thickness; Carbon; carbon composites
资金
- Innovation Foundation for Doctor Dissertation of Northwestern Polytechnical University [CX2021006]
- National Natural Science Foundation of China [91860203, 51727804]
- Natural Science Basic Research Plan in Shaanxi Province of China [2020JQ-175]
- Creative Research Foundation of Science and Technology on Thermostructural Composite Materials Laboratory
In this study, a multilayer coating with different sublayer thicknesses was fabricated on SiC-coated C/C composites using plasma spraying. The relationship between sublayer thickness and thermal stress was investigated through finite element analysis and practical experiments, showing a close connection among sublayer thickness, residual stress, and ablation behavior.
Carbon/carbon (C/C) composites are widely used as thermal protection systems for atmospheric re-entry, where they are subjected to strong oxidation and mechanical denudation. Sublayer thickness of multilayer coating has considerable influence on its stress, which further governs their service life in critical environments. In this study, a multilayer coating with different sublayer thicknesses was fabricated on SiC-coated C/C composites using plasma spraying. Prior to the fabrication, finite element analysis (FEA) was firstly established to investigate the relationship between sublayer thickness and thermal stress. Thereafter, the coatings with typical sublayer thickness were verified through practical experiments. Raman spectra and ablated appearances showed well coincidence with the FEA results, pointing out close relationship among sublayer thickness, residual stress and ablation behavior. After testing for 90 s, the sample with optimized thickness owned the least stress (294 MPa) and lowest ablation rates (-0.467 mu m/s and-0.343 mg/s) as compared to other coated ones.
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